| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/mm_types.h> |
| #include <linux/rbtree.h> |
| #include <linux/rwsem.h> |
| #include <linux/spinlock.h> |
| #include <linux/list.h> |
| #include <linux/cpumask.h> |
| |
| #include <linux/atomic.h> |
| #include <linux/user_namespace.h> |
| #include <asm/pgtable.h> |
| #include <asm/mmu.h> |
| |
| #ifndef INIT_MM_CONTEXT |
| #define INIT_MM_CONTEXT(name) |
| #endif |
| |
| /* |
| * For dynamically allocated mm_structs, there is a dynamically sized cpumask |
| * at the end of the structure, the size of which depends on the maximum CPU |
| * number the system can see. That way we allocate only as much memory for |
| * mm_cpumask() as needed for the hundreds, or thousands of processes that |
| * a system typically runs. |
| * |
| * Since there is only one init_mm in the entire system, keep it simple |
| * and size this cpu_bitmask to NR_CPUS. |
| */ |
| struct mm_struct init_mm = { |
| .mm_rb = RB_ROOT, |
| .pgd = swapper_pg_dir, |
| .mm_users = ATOMIC_INIT(2), |
| .mm_count = ATOMIC_INIT(1), |
| .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), |
| .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), |
| .arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock), |
| .mmlist = LIST_HEAD_INIT(init_mm.mmlist), |
| .user_ns = &init_user_ns, |
| .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0}, |
| INIT_MM_CONTEXT(init_mm) |
| }; |